I definitely have a hard time doing things when other people are in the room, but it doesn't really have anything to do with people judging my taste in tv shows, books, music, websites, or anything like that. All I know is that I feel terribly awkward and self-conscious and have a much harder time concentrating on whatever it is I'm doing--and given my ADD issues, concentrating is something I have a hard enough time doing to begin with. Feeling like I'm being observed by someone else makes it even harder.
But as uncomfortable as it is for me to be observed doing something passive (reading, watching tv, etc.), it's even worse if someone else is in the room when I'm performing some kind of action, no matter how simple or commonplace (e.g., washing my hands, sweeping the floor, making a sandwich, washing the dishes). That's when I get really self-conscious.